What Causes Intermittent Transmission Failure in Citroen C-Quatre?

[MelanieRose]

Intermittent transmission failure in Citroen C-Quatre may result from the following causes: 1. Poor contact: Loose grounding wire of the temperature sensor causes abnormal low-temperature readings in data streams. Low-temperature air has higher density, increasing fuel injection pulse width and resulting in over-rich air-fuel mixture. 2. Sensor short circuit: Data streams show abnormal high-temperature readings. High-temperature air has lower density, reducing fuel injection pulse width and causing over-lean air-fuel mixture. Higher intake air temperature normally requires richer mixture, but sensor circuit break or poor grounding leads to over-lean mixture and starting difficulties. 3. Sensor short circuit: Engine coolant temperature sensor short circuit shows over 100°C in data streams, creating over-lean mixture that prevents starting; sensor circuit break or poor grounding connection displays below -30°C readings, causing over-rich mixture and black smoke from exhaust.